## setup ##

# clean environment
rm(list=ls())

# load packages
library(sandwich)
library(lmtest)

# load data
dat <- read.csv2("data_experiment_outcomes_csv.csv",
                 encoding = 'UTF-8')

# outcome variable to numeric
dat$response <- as.numeric(as.character(dat$response))


## set up ITT by recoding non-treated as non-responses ##
dat$response[dat$treated==0] <- 0


## models ##

# column 1
mod_1 <- lm(response~immback+partisan, data=dat)

# column 3
mod_3 <- lm(response~immback*partisan, data=dat)


## robust standard errors

# column 1
mod_1_rob <- coeftest(mod_1, vcov = vcovHC(mod_1, "HC1"))

# column 3
mod_3_rob <- coeftest(mod_3, vcov = vcovHC(mod_3, "HC1"))


## show coefficients and SEs
mod_1_rob
mod_3_rob
